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Scope Newsletters 16 SCOPE NEWSLETTER NUMBER TWENTYPIVE DECEMBER 1997 AUSTRALIA p.2 ITALY p.S DARLING RIVER ALGAL BLOOMS ALTERNATING AEROBIC AND A three year project was carried out in the ANAEROBIC CONDITIONS TO Darling River at Bourke, the geographical INCREASE PHOSPHATE REMOVAL centre of the well-documented 1991 algal FROM W ASTEWATER bloom. The purpose was to study whether Traditional wastewater treatment plants do not nutrients or other factors were limiting algal exceed P efficiencies of 30%. The Phostrip, growth Bardenpho and A/0 processes, recently developed and implemented in sewage plants AUSTRALIA p.2 have substantially improved this P recovery. THE CATCHMENT MANAGEMENT This paper, focusing on A/0, describes the SUPPORT SYSTEM (CMSS) - A PILOT optimisation of this process in a laboratory­ STUDY IN THE MURRUMBIDGEE scaled single basin, by alternating sequences of CMSS, a decision support system, was aerobic and anaerobie phases. developed for the Murrumbidgee catchment, (81 948km2). The simple computer program NETHERLANDS p.6 needs neither a technical nor computing HIGH NUTRIENT REMO VAL IN THE background to set-up. This pilot study THREE-SLUDGE SEWAGE TREATMENT demonstrated the application of the system to a This three stage concept combines a high­ specifie area as an initial phase prior to its loaded activated sludge plant plus a settler for application to major catchments in New South the biological removal of P, with two biofilm Wales. reactors for nitrification and denitrification (by adding a carbon source). A pilot unit (2-3p.e.) IRELAND p.3 showed that sufficient residence time for PHOSPHORUS LOSS FROM SOIL TO bacteria activity was critical in P removal (to WATER lmg/1) but that N reactors were relatively flow This book, published following an insensitive. A patent is pending. international workshop, provides a valuable reference resource on the state of knowledge of INTERNATIONAL p.7 both pathways and mechanisms associated with SECONDARY SETTLING TANKS phosphorus !osses from field and catchments. Over the last 25 years the adverse effect of wastewater discharges on the aquatic UNITED KINGDOM p.4 environment has led to stringent legislation PRECISION F ARMING FOR controlling treatment plant outputs. This FERTILISER APPLICATION POLICIES International Association on Water Quality This paper reviews the utilisation of fertilisers (IAWQ) report concentrates on improved in precision farming as part of an integrated activated sludge systems and the need to back management system. The distinguishing factor this treatment stage with a weil designed SST is the acknowledgement that significant thereby ensuring effluent quality under variability exists not only between fields but fluctuating influent quality and quantity also within them. conditions. SCOPE NEWSLETTER produced by NEWTON CONSULTING NETWORK- 9, rue Newton - 75116 PARIS FRANCE -Tel. 33-1-53-97-7698 AUSTRALIA also divided into readily bioavailable DIN (dissolved inorganic nitrogen), the less DARLING RIVER ALGALBLOOMS assimilable organic nitrogen compounds, and particulate-bound N. The National Resource Management A Centre (NRMS) has recently finished a study of the readily bioavailable nutrients three year project in the Darling River at (DIN:FRP) showed that (as later confirmed in Bourke, the geographical centre of the a bioassays experiment in a field ail 6 well-documented 1991 algal bloom. The laboratory) samples tested suggested purpose was to study whether nutrients or nitrogen limitation. other factors were limiting algal growth. However, these methods do not determine The Vollenweider model, developed from possible limitation at the time of sampling. ln European and N.American research, was situ measurements to determine the initially used to study a series of weir pools instantaneous physiological response in the connected by short riverine stretches. It was algal cell to nutrient spike using Nutrient found that Chlorophyll-a concentrations v. Induced Fluorescence Transient ("NIFT") 8 total P loading did not match levels predicted assays showed that 2 of samples were by the model developed for deep lakes, and in nutrient limited and both of these a riverine context can only be considered as demonstrated N deficiency. The authors indicative. So, what is limiting algal growth conclude that these conditions can provide a in the Darling River? competitive advantage to cyanobacteria, which can fix atmospheric nitrogen and are This has led to the development of two not dependent on water-born DIN. hypotheses: In the case of the second hypothesis, it was • "algal growth is limited by nutrient availability ". found that turbidity at Bourke was clearly related to flow regime during the study • "the light climate in the Darling River is usually inadequate for algal photosynthesis and period (median turbidity 250 NTU). The hence light availability controls algal growth". analysis of the 2 longest "no water flow" periods since 1945 in '94 and '95 In the first hypothesis, TN:TP ratios were at demonstrated that it is a combination of first determined - sorne of the 8 samples were water column stratification and increased found to be N limited, whilst others were P light penetration due to decreased turbidity limited. that provides a dramatically improved light climate for algal photosynthesis. However, However, use of TN:TP ratios in Australian even if turbidity was normally less than 40 A. conditions is limited, as not all N or P is NTU during the large Circinalis bloom in bioavailable. Often a very small amount of 1991, it was found that extended periods of total P is in the nominally dissolved fraction low turbidity were not the only influencing ( < 0.003JLm). This is known as filterable factor in excessive algal growth for turbidities reactive phosphorus (FRP) and is assumed to have often been �40 NTU without the be the most readily bioavailable. Total N is development of large blooms. 2 �-��----��---� SCOPE NEWSLETTER � -------- T o conclude, if there is indeed sufficient CMSS can thus be used to assess the impact bioavailable phosphorus in the Darling River of nutrient loading from changes in land use for an algal bloom to occur at any time, it is and management practices. The system stores the imbalance between the consumption of the quality of the information and can the FRP by the alg�e and the slow rate of its indicate any gaps in the information as weil resupply stemming from the sediments, that as reliability of outputs. actually limit eventual algal biomass. This re­ supply can be further retarded by Although data demands are minimal, manipulating nver flows to prevent collection of the data was time consuming stratification. due to the size of the area. 53 subcatchments, MR. Grace, Mraci, B. T.Hart, Fraci, R.L. Oliver each with 20-99 mapping units, were & C.M.Rees. Chemistry in Australia, August identified. Shortcomings included the 1997, Vol. 64, N°7,pp 2-5 absence of an instream nutrient assimilation component and nutrient bio-availability factors. AUSTRALIA CMSS includes a policy module - it accepts THE CATCHMENT MANAGEMENT and analyses land use and management SUPPORT SYSTEM (CMSS)- A PILOT "policy" statements. It also includes a STUDY IN THE MURRUMBIDGEE predictive model component involving a simple nutrient balance madel - thus it can CMSS, a decision support system, was calculate likely nutrient loads given a developed for the Murrumbidgee particular land use pattern and set of Catchment, an area of 81 948km2, within generation rates. the Murray Darling Basin. The simple computer program does not need a Land use data was extended to register point technical or computing background to set­ sources - sewage treatment plants, piggeries up. This pilot study demonstrated the and fish farms. application of the system to a specifie area as an initial phase prior to its application Nutrient loads were calculated using '93 to major catchments in New South Wales. conditions- 3 400±595 tonnes total P and 26 000±4 500 tonnes total N. Overall, average The area covers several large population total P and N generated is 0.4±0.1 kg ha-l - -1 centres and much of the intensive farming year·l and 3.2±0.5 kg ha l year involves irrigated agriculture. respectively. The land use contributions showed that 95% of nutrients are generated The system needs carefully collected and by diffuse source and only 5% by point accurate information. Four key sets of data sources. Dry land cropping, unimproved and are required: improved pasture generate 80% of all • land use data nutrient loads; sewage treatment plants • mapped land attributes generate only 4%. • expert assessment of nutrient generation rates • land use and land management practices. 3 These results highlight the need to focus on This publication should form the basis for certain parts of the catchment and consider the development of workable strategies for the use of buffer strips etc. to reduce diffuse controlling agricultural P !osses and reducing nutrient source inputs. CMSS has been or completely preventing this potential incorporated into the NSW Algal contribution to eutrophication. Management Strategy and implemented in H Tunney O. T.Carton, P.C.Brookes & A.E. many NSW catchments. The Murrumbidgee johnston. 468p., CAN International CMSS is now being revisited to prepare its Publishing, 1997, ISBN 0 85199 156 4. catchment nutrient management plan. S. Cuddy, B. Young, R.Davis & Trevor Farley. Managing Algal Blooms, Ch.9, pp. 103-113, UNITED KINGDOM 1997 ISBN 0 643 060499. PRECISION FARMING FOR FERTILISER APPLICATION POLICIES
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